大约有 21,000 项符合查询结果(耗时:0.0354秒) [XML]

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How to get a vertical geom_vline to an x-axis of class date?

Even though I found Hadley's post in the google group on POSIXct and geom_vline , I could not get it done. I have a time series from and would like to draw a vertical line for years 1998, 2005 and 2010 for example. I tried with ggplot and qplot syntax, but still I either see no vertical line ...
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How do I change the highlight style in Vim spellcheck?

Right now, when I do :set spell in my Vim, I get spelling errors highlighted as if they are selected text. What I want is an MS-Word like underlining of spelling errors. I tried to lookup :help spell but could not find a clue. Any help is appreciated. ...
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Android SQLite: nullColumnHack parameter in insert/replace methods

The Android SDK has some convenience methods for manipulating data with SQLite. However both the insert and replace methods use some nullColumnHack parameter which usage I don't understand. ...
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How do you append to an already existing string?

I want append to a string so that every time I loop over it will add say "test" to the string. 7 Answers ...
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What kind of virtual machine is BEAM (the Erlang VM)?

From what I understand a virtual machine falls into two categories either "system virtual machine" or a "process virtual machine". It's kind of fuzzy to me where BEAM lies. Is there another kind of virtual machine I am not aware of? ...
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Use RSA private key to generate public key?

I don't really understand this one: 9 Answers 9 ...
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increase legend font size ggplot2

Is there a way to increase the font size in ggplot2 ? I think I need to specify something like legend.key.width = unit(2, "line") in the theme function, but that is used to adjust the keys in legends, not the font sizes. Thanks! ...
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regex to match a single character that is anything but a space

I need to match a single character that is anything but a space but I don't know how to do that with regex. 2 Answers ...
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Invoke-WebRequest, POST with parameters

I'm attempting to POST to a uri, and send the parameter username=me 4 Answers 4 ...
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Using .sort with PyMongo

With PyMongo, when I try to retrieve objects sorted by their 'number' and 'date' fields like this: 1 Answer ...